Basically every character designed by Tetsuya Nomura, with the exception of those in FFVIII and some characters in FFVII.
Let's go over Nomura's wall of infamy.
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Awful character, awful personality, doesn't even know how to wear pants correctly. The only reason I can figure for her popularity is because of all the PDFs in the anime community.
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Tidus has an ok personality and I get that his look might be popular in Japan because they are like 3 decades behind stuck with the glam femboy look from the 80's. All I know that his asymmetric pants and chains and fisherman overalls look stupid as fuck. And his androgynous look made him the butt of jokes and memes in the early 2000's. Not that it was necessarily fair, but you gotta read the room sometimes and not alienate your overseas audience.
Lulu was already mentioned, so I won't go over her. There are more I can mention but I'll stop right now.